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  2. Electric charge - Wikipedia

    en.wikipedia.org/wiki/Electric_charge

    Electric charge is a conserved property: the net charge of an isolated system, the quantity of positive charge minus the amount of negative charge, cannot change. Electric charge is carried by subatomic particles. In ordinary matter, negative charge is carried by electrons, and positive charge is carried by the protons in the nuclei of atoms ...

  3. Electric current - Wikipedia

    en.wikipedia.org/wiki/Electric_current

    A flow of positive charges gives the same electric current, and has the same effect in a circuit, as an equal flow of negative charges in the opposite direction. Since current can be the flow of either positive or negative charges, or both, a convention is needed for the direction of current that is independent of the type of charge carriers .

  4. Speed of electricity - Wikipedia

    en.wikipedia.org/wiki/Speed_of_electricity

    The magnetic component of the field is considered to be in phase with the current, and the electric component is considered to be in phase with the voltage. The electric field starts at the conductor, and propagates through space at the velocity of light, which depends on the material it is traveling through. [4]

  5. Electricity - Wikipedia

    en.wikipedia.org/wiki/Electricity

    The electric field was formally defined as the force exerted per unit charge, but the concept of potential allows for a more useful and equivalent definition: the electric field is the local gradient of the electric potential. Usually expressed in volts per metre, the vector direction of the field is the line of greatest slope of potential, and ...

  6. Elementary charge - Wikipedia

    en.wikipedia.org/wiki/Elementary_charge

    Charge quantization is the principle that the charge of any object is an integer multiple of the elementary charge. Thus, an object's charge can be exactly 0 e, or exactly 1 e, −1 e, 2 e, etc., but not ⁠ 1 / 2 ⁠ e, or −3.8 e, etc. (There may be exceptions to this statement, depending on how "object" is defined; see below.)

  7. List of SI electromagnetism units - Wikipedia

    en.wikipedia.org/wiki/List_of_SI...

    Symbol [1] Name of quantity Unit name Symbol Base units E energy: joule: J = C⋅V = W⋅s kg⋅m 2 ⋅s −2: Q electric charge: coulomb: C A⋅s I electric current: ampere

  8. Electrometer - Wikipedia

    en.wikipedia.org/wiki/Electrometer

    An electrometer is an electrical instrument for measuring electric charge or electrical potential difference. [1] There are many different types, ranging from historical handmade mechanical instruments to high-precision electronic devices.

  9. Category:Electric charge - Wikipedia

    en.wikipedia.org/wiki/Category:Electric_charge

    Units of electrical charge (8 P) Pages in category "Electric charge" The following 7 pages are in this category, out of 7 total. This list may not reflect recent ...